Air-cooled gas burner



Dec. 16, 1952 D LT 2,621,720

AIR-COOLED GAS BURNER Filed Dec. 2, 1950 IN V EN TOR.

Patented Dec. 16, 1952 AIR-COOLED GAS BURNER Homer D. Dufault,Easthampton, Mass., assignor to Heatbath Appliances, Ine., IndianOrchard, Springfield, Mass., a corporation of Massachusetts ApplicationDecember 2, 1950, Serial No. 198,879

3 Claims.

rected to the provision of a burner construction which is characterizedby a means for cooling the same and for supplying secondary air theretofor combustion.

Heretofore burners have been rendered unserviceable and combustion hasbeen rendered inefficient due to the heating of the burner. With atemperature in the neighborhood of 500 F. prevailing at the burner, gasbreaks down to the extent that there is carbonization such as impairsthe desired complete combustion. The burner is injuriously affectedthereby.

According to this invention, the burner is formed so that it ismaintained at a temperature considerably below 500 F. by the action ofair which is utilized as secondary air whereby the burner not only has avery long useful life but the most efiicient combustion is obtained.

Burner temperatures are far more critical on the yellow or luminous typeburners than they are on the Bunsen flame type burners. The Bunsen typeflame burner usually has a conventional Venturi tube in which the gasorifice draws a considerable amount of air, which is usually at roomtemperature and helps considerably to cool the burner. This is usuallyknown as primary air. Therefore, the Bunsen type of burner will normallyhave cooler operation than the luminous flame type unless it is enclosedin a combustion chamber which reflects considerable heat on the burnerheads that will cause incom plete combustion.

The burner of this invention depends totally upon secondary air forcombustion. This type of construction uses no primary air and for thatreason is subject to much higher operating temperatures.

By means of this invention, 1; use the secondary air needed to supportcombustion around the flame by the flame velocity from each burner portto pass through the ducts. The surrounding parts of these ducts are anintegral part of the burner and aid in the cooling of the burner tube.

The burner of the invention is adapted for many and various purposes andparticularly for use in connection with gases of various types.

All of the above objects I accomplish by means of such structure andrelative arrangements of parts thereof, as will fully appear by aperusal of the description below and by various specific features whichwill be hereinafter set forth.

To the above cited and other ends and with the foregoing and variousother novel features and advantages and other objects of my invention aswill become more readily apparent as the description proceeds, myinvention consists in certain novel features of construction and in thecombination and arrangement of parts as will be hereinafter moreparticularly pointed out in the claims hereunto annexed and more fullydescribed and referred to in connection with the accompanying drawingswherein:

Figs. 1 and 2 are plan and side elevational views respectively showing aburner embodying the novel features of the invention;

Fig. 3 is a sectional elevational view on the line 3-3 of Fig. 1; and

Fig. 4 is an end elevational view of the burner of Figs. 1 and 2 shownin association with side plates.

Referring now to the drawings more in detail, the invention will befully described.

The burner 2 of the invention as shown in the drawings includes an endhead portion 4 for connection to a gas supply, control mechanism, pilotand the components usually used with burners for gas.

A burner bar 6 extends from the head 4 which has an elongated bore 6fclosed in some manner at its outer end, as by a plug 8.

Circumferentially spaced rows of spaced ports are provided in the bar 6which extend outwardly, from the bore thereof as shown in Fig, 3.

Preferably the axes of the ports of the rows thereof will be disposedrelatively angularly so that said axes intersect a vertical planepassing through the longitudinal axis of the bore and above a horizontalplane passing therethrough.

A suitable angle a has been found to be in the neighborhood of degrees.

Upper fins l2 integral with the bar 6 extend horizontally outwardlytherefrom and. a lower fin it extends vertically downwardly therefrom sin Fig. 3.

p The fins absorb heat from the bar as it is heated during combustionand tend to dissipate and reduce temperature of v the entire structureand maintain it well below 500 F.

Burners of the type to which the invention relates are usually disposedin apparatus with which they are used so that the burner bar extendshorizontally between plates P with narrow air passageways S at oppositesides thereof as shown in Fig. 4. This is so that air may flow upwardlyand wipe across the bar.

According to this invention, the horizontal fins 12 not only providesurfaces of large area for dis- .sipating heat but the vertical fin l3provides additional surfaces and serves to support and reinforce theburner bar against any tendency to warp. Altogether therefore the finscooperate to provide surface areas and reinforcement for the bar.

As an added feature the horizontal fins I2 are provided withlongitudinally spaced ducts extending vertically therethrough. Theseducts provide a multiplicity of surfaces which altogether provide a veryconsiderable surface area.

In operation of the burner, air flows upwardly through space S so as towipe across the fins and burner bar and to pass through the ducts H andwipe the surfaces presented thereby to cool the structure and at thesame time serve as secondary air for the combustion of gas requiringsecondary air. The flow of air is indicated by the arrows in Fig. 4.

The construction is such that sufiicient air is presented so that by thewiping action of air the temperature of the structure is held below thatwhere carbonization results wherefore the burner operates for maximumefliciency over a lon useful life.

The burner may be formed from ceramic material or from metal as may bedesired. Ceramic material will be preferable but it is not desired to belimited thereto.

The invention may be embodied in other specific forms without departingfrom the essential characteristics thereof. Hence, the present en--bodiments are therefore to be considered in all respects merely as beingillustrative and not as being restrictive, the scope of the inventionbeing indicated by the appended claims rather than by the foregoingdescription, and all modifications and variations as fall within themeaning and purview and range of equivalency of the appended claims aretherefore intended to be embraced therein,

What it is desired to claim and secure by Letters Patent of the UnitedStates is:

1. A gas burner construction adapted for disposition horizontally in acombustion chamber comprising in combination, an elongated burner barhaving an elongated bore and provided with circumferentially spacedlongitudinal rows of relatively spaced ports extending from said borethrough the upper side thereof, continuous longitudinal fins at oppositesides of said burner. bar extending substantially throughout the lengththereof disposed in parallel planes parallel to a plane extendingthrough the longitudinal axis of said burner bar, and a longitudinal finextending downwardly from said bar substantially throughout the lengththereof disposed between said first named fins and at right angles tosaid first named fins, said first named fins provided withlongitudinally spaced ducts therethrough for the passage of air indirections at right angles to a plane extending through the.longitudinal axis of said burner bar.

2. A gas burner construction comprising in combination, a head, anelongated burner bar extending from. said head having a longitudinalbore provided with a longitudinal axis, a continuous elongated side finextending along and radially outwardly from opposite longitudinal sidesof said burner bar disposed in parallel planes in parallelism with aplane extending through the said longitudinal axis and below the planeof an upper side of said bar, a continuous elongated lower fin extendingalong and radially outwardly from a lower side of said burner bardisposed between and at substantially right angles to said side fins,said burner bar provided with circumferentially spaced longitudinal rowsof relatively spaced ports extending therethrough from the bore thereofand disposed at the upper side of the bar between the side fins, saidside provided with longitudinally spaced ducts therethrough fordirecting air past the burner tube in planes at right angles to thelongitudinal axis of the bore.

3. A gas burner construction according to claim 2 wherein the ports ofthe burner bar have longitudinal axes arranged whereby the axes of i theports of the rows thereof are disposed at opposite sides of a planeextending vertically through the longitudinal axis of the bore of theburner bar and at right angles thereto and converge downwardly in saidplane and at a point below the upper side of said bar.

HOMER D. DUFAULT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Grayson Jan. 29, 1929

